package com.xticfc.util;

import java.awt.Color;  
import java.awt.Font;  
import java.awt.Graphics2D;  
import java.awt.image.BufferedImage;  
import java.io.FileOutputStream;  
import java.io.IOException;  
import java.io.OutputStream;  
import java.util.Random;  
  
import javax.imageio.ImageIO;  
/** 
 * 验证码生成器 
 * @author  xticfc
 * 
 */  
public class ValidateCode {  
    // 图片的宽度。  
    private int width = Constants.getIntValue("validateCode.image.width", 160);  
    // 图片的高度。  
    private int height = Constants.getIntValue("validateCode.image.height", 40);  
    // 验证码字符个数  
    private int codeCount = Constants.getIntValue("validateCode.text.length", 5);  
    // 验证码干扰线数  
    private int lineCount = Constants.getIntValue("validateCode.line.total", 160);  
    // 验证码  
    private String code = null;  
    // 验证码图片Buffer  
    private BufferedImage bufferedImage=null;  
  
    private char[] codeSequence = Constants.get("validateCode.text.string", "").toCharArray();
  
    public  ValidateCode() {  
        this.createCode();  
    }  
  
    /** 
     *  
     * @param width 图片宽 
     * @param height 图片高 
     */  
    public  ValidateCode(int width,int height) {  
        this.width=width;  
        this.height=height;  
        this.createCode();  
    }  
    /** 
     *  
     * @param width 图片宽 
     * @param height 图片高 
     * @param codeCount 字符个数 
     * @param lineCount 干扰线条数 
     */  
    public  ValidateCode(int width,int height,int codeCount,int lineCount) {  
        this.width=width;  
        this.height=height;  
        this.codeCount=codeCount;  
        this.lineCount=lineCount;  
        this.createCode();  
    }  
      
    public void createCode() {  
        int x = 0,fontHeight=0,codeY=0;  
        int red = 0, green = 0, blue = 0;  
        if(codeSequence.length == 0){
        	codeSequence = new char[]{'1', '2', '3', '4', '5', '6', '7', '8', '9'};
        }
        
        x = width / (codeCount +2);//每个字符的宽度  
        fontHeight = height - 2;//字体的高度  
        codeY = height - 4;  
          
        // 图像buffer  
        bufferedImage = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);  
        Graphics2D g = bufferedImage.createGraphics();  
        // 生成随机数  
        Random random = new Random();  
        // 将图像填充为白色  
        g.setColor(Color.white);  
        g.fillRect(0, 0, width, height);  
        // 创建字体  
        ImgFontByte imgFont=new ImgFontByte();  
        Font font =imgFont.getFont(fontHeight);  
        g.setFont(font);  
          
        for (int i = 0; i < lineCount; i++) {  
            int xs = random.nextInt(width);  
            int ys = random.nextInt(height);  
            int xe = xs+random.nextInt(width/8);  
            int ye = ys+random.nextInt(height/8);  
            red = random.nextInt(255);  
            green = random.nextInt(255);  
            blue = random.nextInt(255);  
            g.setColor(new Color(red, green, blue));  
            g.drawLine(xs, ys, xe, ye);  
        }  
          
        // randomCode记录随机产生的验证码  
        StringBuffer randomCode = new StringBuffer();  
        // 随机产生codeCount个字符的验证码。  
        for (int i = 0; i < codeCount; i++) {  
            String strRand = String.valueOf(codeSequence[random.nextInt(codeSequence.length)]);  
            // 产生随机的颜色值，让输出的每个字符的颜色值都不同。  
            red = random.nextInt(80);  
            green = random.nextInt(80);  
            blue = random.nextInt(80);  
            g.setColor(new Color(red, green, blue));  
            g.drawString(strRand, (i + 1) * x, codeY);  
            // 将产生的四个随机数组合在一起。  
            randomCode.append(strRand);  
        }  
        code=randomCode.toString();       
    }  
      
    public void write(String path) throws IOException {  
        OutputStream outputStream = new FileOutputStream(path);  
        this.write(outputStream);  
    }  
      
    public void write(OutputStream outputStream) throws IOException {  
        ImageIO.write(bufferedImage, "png", outputStream);  
        outputStream.close();  
    }  
    public BufferedImage getBuffImg() {  
        return bufferedImage;  
    }  
      
    public String getCode() {  
        return code;  
    }  
}  
